The new ability was in the twins' minds, and they could access it anytime they wanted as if it had always been there. The moment they wished for it, their two bodies seemed to fade away, just to be replaced by a new one identical to themselves but slightly taller.
The first thing Kafan did was to use his Divine Sense and check their cultivation. "Unbelievable... You truly jumped a stage in cultivation just because you merged together. You are obviously in the Initial Stage of the Divinity Realm now."
The twins raised their hand, finding it weird. "It is quite different... We can indeed feel that our cultivation is in the Initial Stage of the Divinity Realm. Both of us have our own thoughts regarding our own things, but when it comes to the use of this body, our thoughts are the same."
Kafan then returned to his Death Spirit Form. "Since that's the case, let's put it to the test."
[Ahem...] Sister Orb intervened. [I don't think you have time for it.]